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You can use the above link to get some more information on this unit. We have several parts available as well as the manual for this model. It sounds like you could be dealing with either a faulty keypad or a bad display.

Usually it is due to bad batteries or remote is too far away from home unit. Put units next to each other and press the channel button on front of the home unit. It will start a search to find the remote. If it finds it with a temp reading press the channel button again and you should hear a beep. Channel is locked in. If you still do not get a temp reading try changing batteries in both units and try again. Another try is to unplug the home unit and wait several minutes with no batteries in either house unit or remote. Replace batteries in remote then in house unit and plug back into power. Set all settings and see if you get the reading. If not try step one again. Weak batteries will do the same thing as well as remote to far away from unit.

This could a bad temperature sensor or a bad clock.(ERC).Disconnect the power.Remove the rear panel.Unhook the temperature sensor wire and test the temp sensor with a volt/ohm meter set for ohms.A plus/minus reading of 1100 ohms is good.If temp sensor reads good replace the ERC(clock).

Replacing capacitor C3 on the clock board will correct the dimming problem. I will cost you about $2 for the part. Replacing the board does the same thing just with a higher price tag. Unfortunately, tt sounds like you may have a bad "new" board if this problem happened as soon as you put it in.

When I had the dim display problem with mine, the oven still heated up, chimed at temp, etc -- you just couldn't see the numbers. My wife didn't like it, so I fixed it. If your old board works like mine did even though the display is dark, you could try replacing the noted capacitor and see what happens.

Hold down the Display/Menu function button (one of those three buttons on the left of the unit) for about 3-4 seconds until the display reads "t set". When this appears, push the track forward button once (>>|) so the display reads "beep"; now press the play pause button (>||) once. The display will now say "on", push the track forward button (>>|) once to make it read "off"; now push the stop play button. You're done. Enjoy the silence.